气候变化领域集成服务门户(CCPortal): Influence of cloud, fog, and high relative humidity during pollution transport events in South Korea: Aerosol properties and PM2.5 variability

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DOI	10.1016/j.atmosenv.2020.117530
	Influence of cloud, fog, and high relative humidity during pollution transport events in South Korea: Aerosol properties and PM2.5 variability
	Eck T.F.; Holben B.N.; Kim J.; Beyersdorf A.J.; Choi M.; Lee S.; Koo J.-H.; Giles D.M.; Schafer J.S.; Sinyuk A.; Peterson D.A.; Reid J.S.; Arola A.; Slutsker I.; Smirnov A.; Sorokin M.; Kraft J.; Crawford J.H.; Anderson B.E.; Thornhill K.L.; Diskin G.; Kim S.-W.; Park S.
发表日期	2020
ISSN	1352-2310
卷号	232
英文摘要	This investigation examines aerosol dynamics during major fine mode aerosol transboundary pollution events in South Korea primarily during the KORUS-AQ campaign from May 1 – June 10, 2016, particularly when cloud fraction was high and/or fog was present to quantify the change in aerosol characteristics due to near-cloud or fog interaction. We analyze the new AERONET Version 3 data that have significant changes to cloud screening algorithms, allowing many more fine-mode observations in the near vicinity of clouds or fog. Case studies for detailed investigation include May 25–26, 2016 when cloud fraction was high over much of the peninsula, associated with a weak frontal passage and advection of pollution from China. These cloud-influenced Chinese transport dates also had the highest aerosol optical depth (AOD), surface PM2.5 concentrations and fine mode particle sizes of the entire campaign. Another likewise cloud/high relative humidity (RH) case is June 9 and 10, 2016 when fog was present over the Yellow Sea that appears to have affected aerosol properties well downwind over the Korean peninsula. In comparison we also investigated aerosol properties on air stagnation days with very low cloud cover and relatively low RH (May 17 & 18, 2016), when local Korean emissions dominated. Aerosol volume size distributions show marked differences between the transport days (with high RH and cloud influences) and the local pollution stagnation days, with total column-integrated particle fine mode volume being an order of magnitude greater on the pollution transport dates. The PM2.5 over central Seoul were significantly greater than for coastal sites on the transboundary transport days yet not on stagnation days, suggesting additional particle formation from gaseous urban emissions in cloud/fog droplets and/or in the high RH humidified aerosol environment. Many days had KORUS-AQ research aircraft flights that provided observations of aerosol absorption, particle chemistry and vertical profiles of extinction. AERONET retrievals and aircraft in situ measurements both showed high single scattering albedo (weak absorption) on the cloudy or cloud influenced days, plus aircraft profile in situ measurements showed large AOD enhancements (versus dried aerosol) at ambient relative humidity (RH) on the pollution transport days, consistent with the significantly larger fine mode particle radii and weak absorption. © 2020 Elsevier Ltd
英文关键词	Aerosol; Aerosol-cloud interaction; Air pollution; Cloud processes; Remote sensing
语种	英语
scopus关键词	Aerosols; Air pollution; Aircraft; Fog; Particle size analysis; Urban growth; Urban transportation; Aerosol characteristics; Aerosol optical depths; Fine-mode particles; High relative humidities; Particle formations; PM2.5 concentration; Single scattering albedo; Trans-boundary pollution; Atmospheric movements; advection; AERONET; aerosol composition; airborne survey; albedo; cloud cover; fog; pollutant transport; relative humidity; transboundary pollution; advection; aerosol; air pollution; aircraft; albedo; algorithm; article; China; humidity; information retrieval; optical depth; particle size; pollution transport; remote sensing; South Korea; Yellow Sea; Pacific Ocean; Seoul [South Korea]; South Korea; Yellow Sea
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129477
作者单位	NASA Goddard Space Flight Center, Greenbelt, MD, United States; Universities Space Research Association, Columbia, MD, United States; Yonsei University, Seoul, South Korea; California State University, San Bernardino, CA, United States; NASA Jet Propulsion Lab, Pasadena, CA, United States; SSAI, Lanham, MD, United States; Naval Research Laboratory, Monterey, CA, United States; Finnish Meteorological Institute, Kuopio, Finland; FiberTek Inc., Herndon, VA, United States; NASA Langley Research Center, Hampton, VA, United States; Seoul National University, Seoul, South Korea
推荐引用方式 GB/T 7714	Eck T.F.,Holben B.N.,Kim J.,et al. Influence of cloud, fog, and high relative humidity during pollution transport events in South Korea: Aerosol properties and PM2.5 variability[J],2020,232.
APA	Eck T.F..,Holben B.N..,Kim J..,Beyersdorf A.J..,Choi M..,...&Park S..(2020).Influence of cloud, fog, and high relative humidity during pollution transport events in South Korea: Aerosol properties and PM2.5 variability.Atmospheric Environment,232.
MLA	Eck T.F.,et al."Influence of cloud, fog, and high relative humidity during pollution transport events in South Korea: Aerosol properties and PM2.5 variability".Atmospheric Environment 232(2020).